🚀 Science
NASA's twin ESCAPADE probes to make the first powered Earth flyby by a Mars-bound spacecraft on 7 and 9 November
In 60 seconds: NASA's twin ESCAPADE spacecraft are heading back to Earth for a gravity slingshot on the way to Mars. Spacecraft 1 passes on 7 November and Spacecraft 2 on 9 November, each firing its engine for about nine minutes at closest approach. NASA says this is the first powered Earth flyby by a spacecraft bound for Mars. Each probe gains more than 1,000 miles per hour. They are due at Mars in September 2027.
Why it matters
Planets are not always lined up for Mars. A flyby that adds speed lets a late-leaving probe still reach it, a trick India's own interplanetary missions also use.
Explain it simply
Like a cyclist who dips down a slope to gather speed before the next climb, the probes dive past Earth to pick up the push they need for Mars.
The 3-minute read
What happened
Each of the two refrigerator-sized spacecraft will swing by Earth at an altitude of 600 to 1,100 miles and fire its engine for about nine minutes, rising from roughly Mach 30 to Mach 31.
Background
ESCAPADE launched in November 2025 when Earth and Mars were on opposite sides of the Sun. Instead of waiting 26 months, it looped around the Earth-Sun L2 point and returned to Earth for this boost.
How it works
A spacecraft that passes close to a planet can steal a little of the planet's motion. Adding an engine burn at the closest point, where the effect is strongest, makes the gain bigger. That is why it is called a powered flyby.
What's next
After the burns the team plans several course corrections. The probes reach Mars on 7 and 9 September 2027 and will be the first multi-spacecraft mission to fly in formation there, studying how the solar wind strips away the Martian atmosphere.
What it means for you
Gravity assist is a favourite exam idea: link it with Mangalyaan, which also used Earth-orbit burns before heading to Mars, and with the Mars-Earth launch window of about 26 months.
Key numbers
- 7 & 9 Nov: Dates of the two Earth flybys in 2026
- 1,000+ mph: Speed gained by each spacecraft (over 1,600 km/h)
- Sept 2027: Planned arrival at Mars
Both sides
- NASA team: The flyby is the cheapest way to get a late-launched pair of probes to Mars on time.
- Cautious observers: A first-of-its-kind manoeuvre leaves little room for error; a missed burn could cost the whole mission.
Key terms explained
- Powered flyby
- A close pass by a planet during which the spacecraft also fires its engine, to gain more speed than gravity alone would give.
- Gravity assist
- Using a planet's gravity and motion to change a spacecraft's speed and direction, saving fuel.
The story so far
- Nov 2025: NASA's twin ESCAPADE spacecraft launch, but Earth and Mars are on opposite sides of the Sun. Mars launches normally leave when Earth and Mars line up, which happens about every 26 months. ESCAPADE instead looped around a point called L2 and came back towards Earth.
- 7 and 9 Nov 2026: Each spacecraft passes Earth in turn and fires its engine for about 9 minutes. Spacecraft 1 passes on 7 November and Spacecraft 2 on 9 November. The burn adds more than 1,000 mph to each, according to NASA.
- 7–9 Sep 2027: Planned arrival at Mars for the two spacecraft. Spacecraft 1 is due on 7 September and Spacecraft 2 on 9 September 2027, after a cruise of about 10 months.
- Today: NASA's twin Mars probes to swing past Earth on 7 and 9 November
Exam notes (UPSC, SSC, Banking, PSC)
- ESCAPADE is a NASA mission of two identical spacecraft, launched in November 2025 to study how the solar wind erodes Mars's atmosphere.
- Earth and Mars line up for efficient launches roughly every 26 months.
- A gravity assist (flyby) uses a planet's gravity and motion to change a spacecraft's speed and direction without much fuel.
- The Sun-Earth L2 point lies about 1.5 million km from Earth on the side away from the Sun; many space telescopes sit there.
Likely exam question: What is a gravity-assist flyby, and why do Mars missions sometimes use one instead of launching in the usual 26-month window?